- 1Collection of letters to Richard Trevithick, mainly concerning the design and efficiency of steam-engines (MS/0347)
1815 May - 1831 December, fonds - 2A letter to Richard Trevithick from Davies Giddy regarding steam engine velocity (MS/0347/2)
9th May 1816, item - 3A letter to Richard Trevithick from Davies Giddy regarding steam engines (MS/0347/1)
9th May 1815, item - 4A letter to Richard Trevithick from Davies Giddy regarding steam engine velocity (MS/0347/3)
14th May 1815, item - 5A letter to Richard Trevithick from Davies Giddy regarding calculations associated with steam engines (MS/0347/4)
18th July 1815, item - 6A letter to Richard Trevithick from Davies Giddy regarding arrangement of boiler tubes in Trevithick's Herland Mine engine (MS/0347/5)
31st December 1815, item - 7A letter to Richard Trevithick from Davies Giddy regarding Trevithick's results from his first trial of the Herland pole steam engine (MS/0347/6)
15th February 1816, item - 8A letter to Richard Trevithick from Davies Giddy regarding theoretical treatment of ex-pansive working of a non- condensing high-pressure steam-engine (MS/0347/7)
16th February 1816, item - 9A reply letter to Richard Trevithick from Davies Giddy since Trevithick's return to England; answers his enquiry about performance figures for early Cornish engines (MS/0347/8)
5th January 1828, item - 10A letter from Davies Giddy advising Richard Trevithick on his future course of action following the failure of a claim for government assistance (MS/0347/9)
26th December 1831, item